Check if vgObject with in a vgChannels FOV

How to Check if a vgObject is in a Channels FOV

Vega Code Example

This example function illustrates how to check to see if a given vgObject is with the bounds of a given vgChannels field of view (FOV)

#include "vg.h" // main include file for Vega

#include "vgperf.h" // for the Vega Performer node functions

#include "vgutil.h"

#include "pf.h" // main include file for Performer

#include "pfutil.h"

bool

isObjectWithChannelsFOV(vgObject *obj, vgChannel *chan){

// #############################################################

// #

// # Public Function

// #

// # Returns true if the vgObject is with the current field of

// # view of the vgChannel other wise returns false

// #

// #############################################################

bool result = false;

// Sanity check we object

if( obj == NULL )

return result;

// if no channel use the first channel

if( chan == NULL )

chan = vgGetChan(0);

// We need to get the Objects root pfNode

pfNode *node = vgGetObjPfNode( obj );

if( node == NULL )

return result;

// We need to get the Channels root pfNode

pfChannel *pfchan = vgGetPfChan( chan );

if( pfchan == NULL )

return result;

// We need to get the objects bounding sphere

pfSphere bsphere;

pfGetNodeBSphere( node, &bsphere);

// Now do the test and return true is found in side

result = pfChanContainsSphere ( pfchan, &bsphere);

if( (result & PFIS_ALL_IN ) || (result & PFIS_TRUE ) ||

(result & ( PFIS_TRUE | PFIS_ALL_IN | PFIS_MAYBE) ))

return true

return false;

} // isObjectWithChannelsFOV

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